Homogeneous sector models

Due to the poor availability of corporate data, the database is small for individual industry models. The industrial model was thus established on the basis of 153 corporations. The alternative of generating larger samples entails the major problem of making a distinction between industries impossible. Nevertheless, the goal to build further more detailed and homogeneous sector models like an airline model seems to be impossible due to insufficient data. For this reason airlines are rated with the industrial model. 

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